E-bike hub motor with built-in eddy current sensor

Abstract

The utility model belongs to the field of wheel hub motor, concretely is a kind of E-bike wheel hub motor of built-in electric eddy current sensor, including the casing, the central position rotation of the casing is equipped with the main shaft, the fixed mounting of main shaft is equipped with stator support, and the inside wall of stator support near main shaft is detachably fixedly installed with electric eddy current sensor stator;The main shaft is rotatably installed with rotor shell, and the rotor shell is integrated with electric eddy current sensor rotor, and after the induction coil in electric eddy current sensor stator is electrified, alternating magnetic field is generated, and after electric eddy current sensor rotor rotates, eddy current is generated due to electromagnetic induction, and the reverse magnetic field opposite to the original magnetic field direction is generated, for changing the equivalent impedance of coil.The utility model integrates electric eddy current sensor rotor and stator in motor interior, can more accurately detect motor rotor electric angle and position information, compared with traditional hall sensor, and the detection precision is higher, to realize the accurate control to motor, improve the operating efficiency and output performance of motor.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, specifically to an E-bike hub motor with a built-in eddy current sensor. Background Technology

[0002] Electric-assisted bicycles are based on the human-powered bicycle architecture, with an additional power system including a battery, controller, and hub motor. The controller's precision in controlling the motor not only affects the performance of the motor and the entire bicycle but also its range.

[0003] Most current hub motor designs control the motor by sensing position Hall sensors through a controller, which has very low accuracy. The controller cannot achieve precise control of the motor. In addition, position Hall sensors are sensitive to the cleanliness of the installation environment; oil and dust can easily cause the position Hall sensors to fail. Utility Model Content

[0004] The present invention aims to solve the problems of low control accuracy and poor reliability of existing electric power wheel hub motors.

[0005] Therefore, the technical solution adopted by this utility model is as follows: an E-bike hub motor with built-in eddy current sensor, including a housing, a main shaft rotatably mounted at the center of the housing, a stator bracket fixedly mounted on the main shaft, and an eddy current sensor stator detachably fixedly mounted on the inner side wall of the stator bracket near the main shaft.

[0006] A rotor housing is rotatably mounted on the main shaft. An eddy current sensor rotor is integrated inside the rotor housing. When the induction coil inside the stator of the eddy current sensor is energized, it generates an alternating magnetic field. After the eddy current sensor rotor rotates, it generates eddy currents due to electromagnetic induction. The eddy currents generate a reverse magnetic field that is opposite to the original magnetic field, which is used to change the equivalent impedance of the coil.

[0007] Based on the above technical solution, its operating principle and the resulting technical effects are as follows:

[0008] The controller precisely measures the electrical angle of the motor by detecting changes in the voltage of the induction coil inside the stator of the eddy current sensor. This allows for more accurate acquisition of rotor position information, resulting in higher detection accuracy compared to traditional Hall sensors. This effectively improves the motor controller's control precision, enabling finer speed and torque control. Furthermore, the eddy current sensor is less sensitive to environmental factors such as dust, oil, and humidity, making it less prone to failure due to these external factors. In contrast, the position Hall sensor requires a high level of cleanliness in the installation environment, and oil and dust can easily cause it to fail. Therefore, the hub motor of this invention maintains stable, reliable, and interference-resistant performance even in harsh working environments, making it more adaptable and suitable for a wider range of complex applications.

[0009] Furthermore, the housing and the main shaft are rotatably connected by a housing bearing, and a first oil seal is also provided between the housing and the main shaft;

[0010] A rear end cover is detachably fixed to one side of the housing by a first fastening screw. The rear end cover is rotatably connected to the main shaft by an end cover bearing. A second oil seal is provided between the rear end cover and the main shaft. An induction magnet is installed on the inner wall of the rear end cover. The induction magnet is paired with a speed Hall sensor (17).

[0011] Furthermore, the stator bracket is fixedly installed to the main shaft by the second fastening screw, the stator assembly is wound with motor windings, and the stator assembly and the stator bracket are press-fitted together.

[0012] The stator of the eddy current sensor is detachably fixed to the stator bracket by a third fastening screw.

[0013] Furthermore, a speed Hall sensor is fixedly mounted on the side of the stator support away from the rotor housing by adhesive.

[0014] Furthermore, the rotor housing is rotatably mounted to the main shaft via a deep groove ball bearing, the rotor housing is fixed to the outer ring of the deep groove ball bearing, and the main shaft is fixed to the inner ring of the deep groove ball bearing via a first snap ring. The eddy current sensor rotor integrated inside the rotor housing is located on the outer side of the outer ring.

[0015] The rotor housing surrounds the outside of the stator assembly, and magnets are glued and fixedly installed on the inner wall of the rotor housing, with the magnets facing the outer side of the stator assembly.

[0016] Furthermore, a sun gear is fixedly installed on the side of the rotor housing away from the stator assembly by a fourth fastening screw. Multiple planetary gears are meshed on the outer side of the sun gear, and an internal gear ring is meshed on the outer side of the planetary gears. The internal gear ring is fixedly installed on the inner wall of the housing.

[0017] Furthermore, a one-way clutch is installed on the main shaft. The one-way clutch is located on one side of the planetary gear. The one-way clutch includes an outer race and an inner race disposed in the outer race. The outer race and the inner race are coaxially arranged and rotate relative to each other. A wedge, an annular retainer for holding the wedge, and a spring are disposed between the outer race and the inner race.

[0018] Furthermore, the inner race of the one-way clutch is fixedly mounted with a flat key, and a keyway adapted to the flat key is provided on the side wall of the main shaft.

[0019] Furthermore, the planetary gears are configured as three, and a gear shaft is rotatably mounted at the center of the three planetary gears, with the gear shaft fixed to the outer race of the one-way clutch.

[0020] Furthermore, the gear shaft of the one-way clutch is rotatably mounted on the planetary gear via a gear bearing. The inner ring of the gear bearing is fixed to the gear shaft of the one-way clutch via a second snap ring, and the planetary gear is fixed to the outer ring of the gear bearing via a third snap ring.

[0021] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0022] A fixed connection refers to a connection in which parts or components are fixed in place, with no relative movement between them. These connections are divided into two types: detachable and non-detachable.

[0023] (1) Detachable connections use screws, splines, wedges, etc. to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened.

[0024] (2) Non-removable connections mainly refer to welding, riveting, and tenon joints. Since disassembly requires forging, sawing, or oxy-acetylene cutting for repair or replacement, these parts generally cannot be reused. Furthermore, attention should be paid to process quality, technical inspection, and remedial measures (such as correction and polishing) during connection.

[0025] A movable connection refers to a connection in which parts or components are fixed but have relative motion.

[0026] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0027] 1. This utility model integrates an eddy current sensor rotor and stator inside the motor, which can more accurately detect the electrical angle and position information of the motor rotor. Compared with traditional Hall sensors, the detection accuracy is higher, thereby achieving precise control of the motor, improving the motor's operating efficiency and output performance, and making the overall performance of the electric-assisted bicycle better, including stronger acceleration performance, climbing ability and range.

[0028] 2. The eddy current sensor in this invention is not sensitive to environmental factors such as dust, oil, and humidity. Compared with the position Hall sensor, it has strong environmental adaptability and is not easily affected by external environmental factors, ensuring the stable and reliable operation of the motor under harsh working conditions and expanding the application scenarios and scope of electric bicycles.

[0029] 3. This invention integrates the rotor of the eddy current sensor and the rotor housing of the motor into a single design, and mounts the stator of the eddy current sensor on the stator bracket, making the motor structure more compact, effectively reducing the axial dimension of the hub motor, reducing the motor volume and weight, improving the overall vehicle lightweighting level, and facilitating installation and application in limited spaces such as electric power steering wheel hubs. Attached Figure Description

[0030] Figure 1 This is a cross-sectional schematic diagram of the overall structure of this utility model;

[0031] Figure 2 This is a three-dimensional schematic diagram of the stator of the eddy current sensor of this utility model;

[0032] Figure 3 This is a cross-sectional schematic diagram of the stator of the eddy current sensor of this utility model;

[0033] Figure 4 This is a three-dimensional schematic diagram of the rotor housing structure of this utility model.

[0034] Figure label:

[0035] 1. Housing; 2. Planetary gear; 3. One-way clutch; 4. Key; 5. First oil seal; 6. Housing bearing; 7. Main shaft; 8. Gear bearing; 9. Third snap ring; 10. Second snap ring; 11. Internal gear ring; 12. First fastening screw; 13. Magnet; 14. Stator assembly; 15. Stator bracket; 16. Induction magnet; 17. Speed ​​Hall sensor; 18. Fourth fastening screw; 19. Second fastening screw; 20. Second oil seal; 21. End cover bearing; 22. Wiring harness; 23. Third fastening screw; 24. Eddy current sensor stator; 25. Deep groove ball bearing; 26. First snap ring; 27. Rotor housing; 28. Sun gear; 29. ​​Rear end cover; 30. Eddy current sensor rotor; 31. Coil. Detailed Implementation

[0036] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in the embodiments can be combined with each other.

[0037] Example 1:

[0038] Based on the concept of this application, combined with Figures 1 to 4This paper describes an embodiment of an E-bike hub motor with a built-in eddy current sensor. Specifically, the E-bike hub motor with a built-in eddy current sensor is constructed as a single unit, comprising multiple components such as an eddy current sensor stator 24, a rotor housing 27, and an eddy current sensor rotor 30. By integrating the eddy current sensor rotor 30 and the eddy current sensor stator 24 within the motor, the electrical angle and position information of the motor rotor can be detected more accurately. Compared to traditional Hall effect sensors, the detection accuracy is higher, thereby achieving precise control of the motor and improving its operating efficiency and output performance.

[0039] Combination Figures 1-4 As shown, the present invention provides an E-bike hub motor with a built-in eddy current sensor, including a housing 1, a main shaft 7 rotatably mounted at the center of the housing 1, a stator bracket 15 fixedly mounted on the main shaft 7, and an eddy current sensor stator 24 detachably fixedly mounted on the inner side wall of the stator bracket 15 near the main shaft 7.

[0040] A rotor housing 27 is rotatably mounted on the main shaft 7. An eddy current sensor rotor 30 is integrated inside the rotor housing 27. A coil is integrated inside the stator 24 of the eddy current sensor. When energized, it generates an alternating magnetic field. After the eddy current sensor rotor 30 rotates, it generates eddy currents due to electromagnetic induction. The eddy currents generate a reverse magnetic field that is opposite to the original magnetic field, which is used to change the equivalent impedance of the coil.

[0041] In this embodiment, the housing 1 and the spindle 7 are rotatably connected by a housing bearing 6, and a first oil seal 5 is provided between the housing 1 and the spindle 7. A rear end cover 29 is detachably fixed to one side of the housing 1 by a first fastening screw 12. During maintenance, the rear end cover 29 is easily disassembled to inspect and replace the internal motor components. The rear end cover 29 and the spindle 7 are rotatably connected by an end cover bearing 21, and a second oil seal 20 is provided between the rear end cover 29 and the spindle 7. An induction magnet 16 is installed on the inner side wall of the rear end cover 29. The induction magnet 16 is paired with a speed Hall sensor 17 to feed back a speed signal to the controller.

[0042] It should be noted that the first oil seal 5 and the second oil seal 20 can effectively prevent lubricating oil from leaking out from the gap between the housing 1 and the main shaft 7, maintain the integrity of the internal lubrication system of the motor, ensure that the housing bearing 6 and other parts that require lubrication are always in good lubrication condition, and reduce wear between parts. At the same time, the first oil seal 5 and the second oil seal 20 can also prevent external dust, water, oil and other impurities from entering the motor, avoiding these impurities from contaminating and damaging key components such as the windings and eddy current sensors inside the motor. For example, when riding in the rain or passing through muddy roads, the oil seals can effectively prevent rainwater and mud from entering the motor.

[0043] Regarding the technical solution of this embodiment, the stator bracket 15 is fixedly installed on the main shaft 7 by the second fastening screw 19. The stator assembly 14 is wound with motor windings, and the stator assembly 14 and the stator bracket 15 are press-fitted together. The stator bracket 15 is fixedly installed on the main shaft 7 by the second fastening screw 19, which provides stable and reliable support for the stator assembly 14, ensuring the positional accuracy and stability of the stator assembly 14 during motor operation, and preventing it from being displaced or deformed due to vibration or load changes.

[0044] The stator 24 of the eddy current sensor is detachably fixed to the stator bracket 15 by the third fastening screw 23, which makes it easy and quick to remove the eddy current sensor from the stator bracket 15 when maintenance, repair or replacement is required, without having to disassemble the entire stator bracket 15 or the motor in a large-scale manner, thus reducing maintenance costs and time and improving the maintainability of the motor.

[0045] In this embodiment, a speed Hall sensor 17 is glued to the side of the stator bracket 15 away from the rotor housing 27. The speed Hall sensor 17 can measure the rotational speed of the motor rotor in real time and accurately. It converts the mechanical rotation of the rotor into an electrical signal by detecting the change in the magnetic field of the magnet 13 on the rotor, and then calculates the actual rotational speed of the motor. The glued fixing method is used because the adhesive can fill the tiny gap between the sensor and the stator bracket 15, so that the sensor and the bracket are tightly attached, ensuring that the sensor will not have any slight displacement or loosening in the installation position, thereby improving its measurement accuracy and ensuring that the motor control system can accurately obtain the motor speed information.

[0046] It should be noted that the main spindle 7 is equipped with a complete machine wiring harness 22, which passes through the main spindle 7 and is connected to the three-phase lines of the stator assembly 14, the signal lines of the eddy current sensor stator 24, and the signal lines of the speed Hall sensor 17.

[0047] In this embodiment, the rotor housing 27 is rotatably mounted to the main shaft 7 via a deep groove ball bearing 25. The rotor housing 27 is fixed to the outer ring of the deep groove ball bearing 25, and the main shaft 7 is fixed to the inner ring of the deep groove ball bearing 25 via a first snap ring 26. The eddy current sensor rotor 30 integrated in the rotor housing 27 is located outside the outer ring, and the main shaft 7 is fixed to the inner ring of the deep groove ball bearing 25 via the first snap ring 26. This connection method is simple and reliable, and can ensure good coaxiality between the main shaft 7 and the inner ring of the bearing.

[0048] The rotor housing 27 surrounds the outside of the stator assembly 14, and magnets 13 are glued and fixedly installed on the inner wall of the rotor housing 27, with the magnets 13 facing the outer side of the stator assembly 14. This arrangement allows the magnetic field to be more evenly distributed around the entire stator winding. The uniform magnetic field distribution helps to improve the electromagnetic performance of the motor and ensures that the stator winding can generate a more stable electromagnetic force when energized, thereby improving the output power and efficiency of the motor.

[0049] It should be further explained that the stator 24 of the eddy current sensor is a PCB board, and the rotor 30 of the eddy current sensor is made of aluminum alloy. The rotor of the eddy current sensor and the rotor housing 27 of the motor are integrated as one unit, and the stator of the eddy current sensor is mounted on the stator bracket 15. This can optimize the internal space layout of the motor, further compress the axial dimension of the hub motor, and make the motor arrangement more compact. This is conducive to reducing the size and weight of the motor, improving the integration of the motor and the lightweight level of the whole vehicle, and facilitating installation and application in limited spaces such as the wheel hub of electric power steering.

[0050] Furthermore, structurally, since the position Hall sensor has been eliminated, there will be no electromagnetic interference or magnetic field superposition caused by the position Hall sensor within the stator and rotor range of the motor, which further improves the output performance of the motor.

[0051] Regarding the technical solution of this embodiment, a sun gear 28 is fixedly installed on the side of the rotor housing 27 away from the stator assembly 14 by a fourth fastening screw 18. Multiple planetary gears 2 are meshed on the outer side of the sun gear 28. An internal gear ring 11 is meshed on the outer side of the planetary gears 2. The internal gear ring 11 is fixedly installed on the inner wall of the housing 1.

[0052] Regarding the technical solution of this embodiment, a one-way clutch 3 is installed on the main shaft 7, specifically a wedge-type one-way clutch 3. The one-way clutch 3 is located on one side of the planetary gear 2. The one-way clutch 3 includes an outer race and an inner race disposed in the outer race. The outer race and the inner race are coaxially arranged and rotate relative to each other. A wedge, an annular retainer for holding the wedge, and a spring are disposed between the outer race and the inner race.

[0053] Regarding the technical solution of this embodiment, a flat key 4 is fixedly installed on the inner race of the one-way clutch 3, and a keyway adapted to the flat key 4 is provided on the side wall of the main shaft 7. Through the cooperation of the flat key 4 and the keyway, the inner race of the one-way clutch 3 and the main shaft 7 can be tightly connected together. This connection method can effectively transmit torque and ensure reliable and stable power transmission between the one-way clutch 3 and the main shaft 7.

[0054] In this embodiment, three planetary gears 2 are provided, and a gear shaft is rotatably mounted at the center of the three planetary gears 2. The gear shaft is fixed to the outer race of the one-way clutch 3.

[0055] In this embodiment, the gear shaft is rotatably mounted on the planetary gear 2 via the gear bearing 8. The inner ring of the gear bearing 8 is fixed to the gear shaft via the second snap ring 10, and the planetary gear 2 is fixed to the outer ring of the gear bearing 8 via the third snap ring 9. During installation, it is only necessary to fit the inner ring of the gear bearing 8 onto the gear shaft and fix it with the second snap ring 10. The operation is simple and quick. At the same time, the fixing effect of the second snap ring 10 can ensure that the gear bearing 8 will not loosen due to vibration or other factors during long-term use, thereby improving the reliability of the transmission system.

[0056] Planetary gear 2 is fixed to the outer ring of gear bearing 8 by the third snap ring 9. This connection method further enhances the connection strength between planetary gear 2 and one-way clutch 3. The fixing effect of the third snap ring 9 can prevent planetary gear 2 from axial displacement on one-way clutch 3 and ensure a stable connection between the two.

[0057] Specifically, when the rotor housing 27 drives the sun gear 28 to rotate clockwise, the one-way clutch 3 is locked. At this time, the inner and outer races of the one-way clutch 3 are relatively fixed and form a whole. Due to the locking of the one-way clutch 3, the gear shaft of the planetary gear 2 is fixed, and the planetary gear 2 can only rotate on its own axis and cannot revolve around the sun. At this time, the energy flow is transmitted from the sun gear 28 to the internal gear ring 11 through the planetary gear 2. At the same time, since the internal gear ring 11 is integrated with the housing 1, the energy is transmitted to the housing 1 for power output.

[0058] When the rotor housing 27 rotates counterclockwise, the one-way clutch 3 is in the unlocked state. At this time, the inner and outer races of the one-way clutch 3 can rotate relative to each other. Due to the relative rotation, the gear shaft can drive the planetary gear 2 to revolve. At this time, an additional degree of freedom is released, which prevents the energy flow from the sun gear 28 to the internal gear ring 11 through the planetary gear 2. As a result, the internal gear ring 11 and the housing 1 cannot output power. The purpose of this function is that when the rotor housing 27 rotates in the opposite direction, it cannot drive the housing 1 to rotate in the opposite direction, so that the vehicle will not be in danger of running in the opposite direction.

[0059] The following description, in conjunction with the accompanying drawings and embodiments, provides a further explanation of the E-bike hub motor with a built-in eddy current sensor provided by this utility model.

[0060] An E-bike hub motor with a built-in eddy current sensor includes a housing 1, a main shaft 7 rotatably mounted at the center of the housing 1, a stator bracket 15 fixedly mounted on the main shaft 7, and an eddy current sensor stator 24 detachably fixedly mounted on the inner side wall of the stator bracket 15 near the main shaft 7.

[0061] A rotor housing 27 is rotatably mounted on the main shaft 7. An eddy current sensor rotor 30 is integrated inside the rotor housing 27. When the eddy current sensor stator 24 is energized, it generates an alternating magnetic field. After the eddy current sensor rotor 30 rotates, it generates eddy currents due to electromagnetic induction. The eddy currents generate a reverse magnetic field that is opposite to the original magnetic field, which is used to change the equivalent impedance of the coil.

[0062] The working principle and usage process of this utility model: The eddy current sensor accurately measures the electrical angle of the motor by detecting the eddy current effect on the rotor, which can more accurately obtain the rotor's position information. Compared with the traditional Hall sensor, it has higher detection accuracy, which can effectively improve the control accuracy of the motor controller and achieve more precise speed and torque control. Moreover, the eddy current sensor has low sensitivity to environmental factors such as dust, oil, and humidity, and is not easily damaged by these external factors. In contrast, the position Hall sensor has high requirements for the cleanliness of the installation environment, and oil and dust can easily cause it to fail. Therefore, the hub motor of this invention can maintain stable and reliable performance even in harsh working environments, has stronger adaptability, and can be used in more complex application scenarios.

[0063] In this invention, the term "plural" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An E-bike hub motor with a built-in eddy current sensor, comprising a housing (1), characterized in that, A main shaft (7) is rotatably mounted at the center of the housing (1). A stator bracket (15) is fixedly mounted on the main shaft (7). An eddy current sensor stator (24) is detachably fixedly mounted on the inner side wall of the stator bracket (15) near the main shaft (7). A rotor housing (27) is rotatably mounted on the main shaft (7). An eddy current sensor rotor (30) is integrated inside the rotor housing (27). When the eddy current sensor stator (24) is energized, it generates an alternating magnetic field. When the eddy current sensor rotor (30) rotates, it generates eddy currents due to electromagnetic induction. The eddy currents generate a reverse magnetic field opposite to the original magnetic field, which is used to change the equivalent impedance of the coil.

2. The E-bike hub motor with a built-in eddy current sensor according to claim 1, characterized in that, The housing (1) and the main shaft (7) are rotatably connected by the housing (1) bearing, and a first oil seal (5) is also provided between the housing (1) and the main shaft (7); A rear end cover (29) is detachably fixed to one side of the housing (1) by a first fastening screw (12). The rear end cover (29) is rotatably connected to the main shaft (7) by an end cover bearing (21). A second oil seal (20) is provided between the rear end cover (29) and the main shaft (7). An induction magnet (16) is installed on the inner wall of the rear end cover (29). The induction magnet is paired with a speed Hall sensor (17).

3. The E-bike hub motor with a built-in eddy current sensor according to claim 2, characterized in that, The stator bracket (15) is fixedly installed to the main shaft (7) by the second fastening screw (19), the stator assembly (14) is wound with motor windings, and the stator assembly (14) and the stator bracket (15) are press-fitted into one piece; The stator (24) of the eddy current sensor is detachably fixed to the stator bracket (15) by a third fastening screw (23).

4. The E-bike hub motor with a built-in eddy current sensor according to claim 2, characterized in that, A speed Hall sensor (17) is fixedly mounted on the side of the stator bracket (15) away from the rotor housing (27) by adhesive.

5. An E-bike hub motor with a built-in eddy current sensor according to claim 4, characterized in that, The rotor housing (27) is rotatably mounted to the main shaft (7) via a deep groove ball bearing (25). The rotor housing (27) is fixed to the outer ring of the deep groove ball bearing (25), and the main shaft (7) is fixed to the inner ring of the deep groove ball bearing (25) via a first snap ring (26). The eddy current sensor rotor (30) integrated in the rotor housing (27) is located on the outer side of the outer ring. The rotor housing (27) surrounds the outside of the stator assembly (14), and a magnet (13) is glued and fixed on the inner wall of the rotor housing (27), with the magnet (13) facing the outer side of the stator assembly (14).

6. An E-bike hub motor with a built-in eddy current sensor according to claim 5, characterized in that, The rotor housing (27) is fixedly mounted with a sun gear (28) on the side away from the stator assembly (14) by a fourth fastening screw (18). Multiple planetary gears (2) are meshed on the outer side of the sun gear (28). An internal gear ring (11) is meshed on the outer side of the planetary gears (2). The internal gear ring (11) is fixedly mounted on the inner wall of the housing (1).

7. An E-bike hub motor with a built-in eddy current sensor according to claim 6, characterized in that, A one-way clutch (3) is installed on the main shaft (7). The one-way clutch (3) is located on one side of the planetary gear (2). The one-way clutch (3) includes an outer race and an inner race disposed in the outer race. The outer race and the inner race are coaxially arranged and rotate relative to each other. A wedge, an annular retainer for holding the wedge, and a spring are disposed between the outer race and the inner race.

8. An E-bike hub motor with a built-in eddy current sensor according to claim 7, characterized in that, The inner race of the one-way clutch (3) is fixedly mounted with a flat key (4), and a keyway adapted to the flat key (4) is provided on the side wall of the main shaft (7).

9. An E-bike hub motor with a built-in eddy current sensor according to claim 8, characterized in that, The planetary gears (2) are configured as three, and a gear shaft is rotatably mounted at the center position of the three planetary gears (2), and the gear shaft is fixed to the outer race of the one-way clutch.

10. An E-bike hub motor with a built-in eddy current sensor according to claim 9, characterized in that, The gear shaft of the one-way clutch (3) is rotatably mounted on the planetary gear (2) via a gear bearing (8). The inner ring of the gear bearing (8) is fixed to the gear shaft of the one-way clutch (3) via a second snap ring (10), and the planetary gear (2) is fixed to the outer ring of the gear bearing (8) via a third snap ring (9).

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